HP Envy 15-ae178ca issues

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  • alexinquest
    Member
    • May 2012
    • 21
    • Canada

    #1

    HP Envy 15-ae178ca issues

    HP Envy 15-ae178ca not starting .
    Laptop has Intel i7-6500u CPU.
    Logic board LA-503p

    No schematics I could find. (Please, share if you have, thanks. Even similar would help.

    From what I could figure out:

    the 3.3v and 5v power supply controller chip as well as the corresponding dual mosFets are faulty. (see picture)
    That's the 8A 2F chip, which is RT8243A .
    The dual mosfets I removed.

    Also there appears to be a short on the 3.3V line (around 1 ohm). Strangely when I apply external voltage on there the only part that warms up is the smaller chip on the CPU, (which, I assume, is the intergrated graphics?).

    I checked around the whole board to see how the voltage could make it there. I can't see any voltage on other power supplies. Can't understand how the 3.3v could make it to the CPU.

    Would appreciate a schematics or some ideas. Thanks.
    Attached Files
  • piernov
    Super Moderator
    • Jan 2016
    • 4435
    • France

    #2
    Re: HP Envy 15-ae178ca issues

    Small die on CPU package is PCH.
    PCH warming up when injecting on 3.3V rail = dead PCH.
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment

    • alexinquest
      Member
      • May 2012
      • 21
      • Canada

      #3
      Re: HP Envy 15-ae178ca issues

      Thanks��
      Is PCH directly powered by 3.3v? Is that typical ?
      Also do U happen to have a schematic similar to this ?

      Comment

      • alexinquest
        Member
        • May 2012
        • 21
        • Canada

        #4
        Re: HP Envy 15-ae178ca issues

        Upon reading up some more on this, it's pretty clear now that the smaller die is indeed the PCH and it's shorted on this laptop .
        I didn't know PCH is powered directly from 3.3V.
        Appreciate your reply, Piernov. thanks.

        Comment

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